The excedra is one inch taller so it will raise the back 1/2 inch and it will move the speedo a little closer correct.Yup, I've run the 55 series on my Roxie.....it's good.
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It will also handle much better due to the shorten rake from raising the back up. You can also go to a lower profile tire in the front and then you'll be amazed at how well that big girl will handle beneath you.